The biggest place I saw violations was when they shuffled around offices after the initial permit and these seldom ever got any kind of inspection.
If someone decided a troffer would be better, over a square or two(as far as the whip would allow) they moved it. If there were supplemental wires they seldom got moved. The light was just dropped into the grid.
I have seen total office remodels with walls moved, HVAC reducted <is that a word?> and new circuits run ... no permit at all. This may be done by the "building maintenance staff" not a contractor.
I don't think I ever saw a permit for a computer room rewire.
